Re: Convert expression to polynomial
- To: mathgroup at smc.vnet.net
- Subject: [mg70415] Re: [mg70383] Convert expression to polynomial
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Mon, 16 Oct 2006 02:34:02 -0400 (EDT)
- Reply-to: hanlonr at cox.net
Use Together x = Together[1 + (-t + t^2)^(-1) + 1/((-t + t^2)^2*(-t + t^4)) + 1/((-t + t^2)^4*(-t + t^4)^2*(-t + t^8))] (t^24 - 4*t^23 + 7*t^22 - 9*t^21 + 12*t^20 - 15*t^19 + 15*t^18 - 13*t^17 + 14*t^16 - 16*t^15 + 14*t^14 - 14*t^13 + 17*t^12 - 16*t^11 + 12*t^10 - 10*t^9 + 9*t^8 - 5*t^7 + 2*t^6 - 2*t^5 + t^4 + 1)/((t - 1)^7*t^7*(t^2 + t + 1)^2*(t^6 + t^5 + t^4 + t^3 + t^2 + t + 1)) PolynomialQuotient[Numerator[x], Denominator[x], t] 1 Bob Hanlon ---- Diana <diana.mecum at gmail.com> wrote: > Math folks, > > I am generating a list of partial sums which look like: > > x = 1 + (-t + t^2)^(-1) + 1/((-t + t^2)^2*(-t + t^4)) + 1/((-t + > t^2)^4*(-t + t^4)^2*(-t + t^8)) > > I then try to calculate the PolynomialQuotient[Numerator[x], > Denominator[x], t], etc., and I get an error saying that x is not a > polynomial function. > > I tried to find the command to put everything over a common > denominator, but was unable to find this. Can someone help? > > Thanks, > > Diana M. > -- Bob Hanlon hanlonr at cox.net